docs(ch03-01): clarify type-mismatch error in spaces example (#4772)#4777
Open
Dodothereal wants to merge 1 commit into
Open
docs(ch03-01): clarify type-mismatch error in spaces example (#4772)#4777Dodothereal wants to merge 1 commit into
Dodothereal wants to merge 1 commit into
Conversation
Fixes rust-lang#4772: the original wording 'we're not allowed to mutate a variable's type' is imprecise and misleading because Rust's shadowing feature allows a variable's type to change. The error is a type-mismatch assignment (E0308), not a blanket prohibition on type changes. Adopted the issue's suggested phrasing, swapped to a single sentence so the explanation stays concise.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Fixes #4772
Summary
Chapter 3.1 currently says 'The error says we're not allowed to mutate
a variable's type' for the compile-time error in the 'spaces'
example. This wording is misleading because Rust's shadowing feature
does allow a variable's type to change; the actual error (E0308)
is a type-mismatch assignment.
This commit adopts the issue's suggested phrasing.
Test plan
AI assistance
Prepared with help from an AI coding assistant; reviewed end-to-end.